Retrieving username from APM iRule

Hello

Is that the complete iRule ?

I used this one before where I set the variables outside the call from the APM module to perform some simple logging.

when ACCESS_POLICY_AGENT_EVENT {
    set loginname [ACCESS::session data get session.logon.last.logonname]
    set emaclientip [ACCESS::session data get session.user.clientip]
    set emasessionid [ACCESS::session data get session.user.sessionid]
    if {[ACCESS::policy agent_id] == "logip"}{
    log "EMA $loginname connected with session ID $emasessionid from ClientIP $emaclientip"
} else {
return
}
}

This bit is throwing me though ...

"testusername" while executing "$username"

Where's the reference to testusername coming from ? Is it further down the iRule or from something else ?